src/js/index.js

   1 (function() {
   2
   3     // mnemonics is populated as required by getLanguage
   4     var mnemonics = { "english": new Mnemonic("english") };
   5     var mnemonic = mnemonics["english"];
   6     var seed = null;
   7     var bip32RootKey = null;
   8     var bip32ExtendedKey = null;
   9     var network = bitcoin.networks.bitcoin;
  10     var addressRowTemplate = $("#address-row-template");
  11
  12     var showIndex = true;
  13     var showAddress = true;
  14     var showPubKey = true;
  15     var showPrivKey = true;
  16     var showQr = false;
  17
  18     var entropyChangeTimeoutEvent = null;
  19     var phraseChangeTimeoutEvent = null;
  20     var rootKeyChangedTimeoutEvent = null;
  21
  22     var generationProcesses = [];
  23
  24     var DOM = {};
  25     DOM.network = $(".network");
  26     DOM.client = $(".client");
  27     DOM.phraseNetwork = $("#network-phrase");
  28     DOM.phraseClient = $("#client-phrase");
  29     DOM.useEntropy = $(".use-entropy");
  30     DOM.entropyContainer = $(".entropy-container");
  31     DOM.entropy = $(".entropy");
  32     DOM.entropyFiltered = DOM.entropyContainer.find(".filtered");
  33     DOM.entropyType = DOM.entropyContainer.find(".type");
  34     DOM.entropyStrength = DOM.entropyContainer.find(".strength");
  35     DOM.entropyEventCount = DOM.entropyContainer.find(".event-count");
  36     DOM.entropyBits = DOM.entropyContainer.find(".bits");
  37     DOM.entropyBitsPerEvent = DOM.entropyContainer.find(".bits-per-event");
  38     DOM.entropyWordCount = DOM.entropyContainer.find(".word-count");
  39     DOM.entropyBinary = DOM.entropyContainer.find(".binary");
  40     DOM.entropyMnemonicLength = DOM.entropyContainer.find(".mnemonic-length");
  41     DOM.phrase = $(".phrase");
  42     DOM.passphrase = $(".passphrase");
  43     DOM.generateContainer = $(".generate-container");
  44     DOM.generate = $(".generate");
  45     DOM.seed = $(".seed");
  46     DOM.rootKey = $(".root-key");
  47     DOM.extendedPrivKey = $(".extended-priv-key");
  48     DOM.extendedPubKey = $(".extended-pub-key");
  49     DOM.bip32tab = $("#bip32-tab");
  50     DOM.bip44tab = $("#bip44-tab");
  51     DOM.bip32panel = $("#bip32");
  52     DOM.bip44panel = $("#bip44");
  53     DOM.bip32path = $("#bip32-path");
  54     DOM.bip44path = $("#bip44-path");
  55     DOM.bip44purpose = $("#bip44 .purpose");
  56     DOM.bip44coin = $("#bip44 .coin");
  57     DOM.bip44account = $("#bip44 .account");
  58     DOM.bip44accountXprv = $("#bip44 .account-xprv");
  59     DOM.bip44accountXpub = $("#bip44 .account-xpub");
  60     DOM.bip44change = $("#bip44 .change");
  61     DOM.generatedStrength = $(".generate-container .strength");
  62     DOM.hardenedAddresses = $(".hardened-addresses");
  63     DOM.addresses = $(".addresses");
  64     DOM.rowsToAdd = $(".rows-to-add");
  65     DOM.more = $(".more");
  66     DOM.feedback = $(".feedback");
  67     DOM.tab = $(".derivation-type a");
  68     DOM.indexToggle = $(".index-toggle");
  69     DOM.addressToggle = $(".address-toggle");
  70     DOM.publicKeyToggle = $(".public-key-toggle");
  71     DOM.privateKeyToggle = $(".private-key-toggle");
  72     DOM.languages = $(".languages a");
  73     DOM.qrContainer = $(".qr-container");
  74     DOM.qrHider = DOM.qrContainer.find(".qr-hider");
  75     DOM.qrImage = DOM.qrContainer.find(".qr-image");
  76     DOM.qrHint = DOM.qrContainer.find(".qr-hint");
  77     DOM.showQrEls = $("[data-show-qr]");
  78
  79     function init() {
  80         // Events
  81         DOM.network.on("change", networkChanged);
  82         DOM.client.on("change", clientChanged);
  83         DOM.useEntropy.on("change", setEntropyVisibility);
  84         DOM.entropy.on("input", delayedEntropyChanged);
  85         DOM.entropyMnemonicLength.on("change", entropyChanged);
  86         DOM.phrase.on("input", delayedPhraseChanged);
  87         DOM.passphrase.on("input", delayedPhraseChanged);
  88         DOM.generate.on("click", generateClicked);
  89         DOM.more.on("click", showMore);
  90         DOM.rootKey.on("input", delayedRootKeyChanged);
  91         DOM.bip32path.on("input", calcForDerivationPath);
  92         DOM.bip44purpose.on("input", calcForDerivationPath);
  93         DOM.bip44coin.on("input", calcForDerivationPath);
  94         DOM.bip44account.on("input", calcForDerivationPath);
  95         DOM.bip44change.on("input", calcForDerivationPath);
  96         DOM.tab.on("shown.bs.tab", calcForDerivationPath);
  97         DOM.hardenedAddresses.on("change", calcForDerivationPath);
  98         DOM.indexToggle.on("click", toggleIndexes);
  99         DOM.addressToggle.on("click", toggleAddresses);
 100         DOM.publicKeyToggle.on("click", togglePublicKeys);
 101         DOM.privateKeyToggle.on("click", togglePrivateKeys);
 102         DOM.languages.on("click", languageChanged);
 103         setQrEvents(DOM.showQrEls);
 104         disableForms();
 105         hidePending();
 106         hideValidationError();
 107         populateNetworkSelect();
 108         populateClientSelect();
 109     }
 110
 111     // Event handlers
 112
 113     function networkChanged(e) {
 114         var networkIndex = e.target.value;
 115         networks[networkIndex].onSelect();
 116         if (seed != null) {
 117             phraseChanged();
 118         }
 119         else {
 120             rootKeyChanged();
 121         }
 122     }
 123
 124     function clientChanged(e) {
 125         var clientIndex = e.target.value;
 126         clients[clientIndex].onSelect();
 127         if (seed != null) {
 128             phraseChanged();
 129         }
 130         else {
 131             rootKeyChanged();
 132         }
 133     }
 134
 135     function setEntropyVisibility() {
 136         if (isUsingOwnEntropy()) {
 137             DOM.entropyContainer.removeClass("hidden");
 138             DOM.generateContainer.addClass("hidden");
 139             DOM.phrase.prop("readonly", true);
 140             DOM.entropy.focus();
 141             entropyChanged();
 142         }
 143         else {
 144             DOM.entropyContainer.addClass("hidden");
 145             DOM.generateContainer.removeClass("hidden");
 146             DOM.phrase.prop("readonly", false);
 147             hidePending();
 148         }
 149     }
 150
 151     function delayedPhraseChanged() {
 152         hideValidationError();
 153         showPending();
 154         if (phraseChangeTimeoutEvent != null) {
 155             clearTimeout(phraseChangeTimeoutEvent);
 156         }
 157         phraseChangeTimeoutEvent = setTimeout(phraseChanged, 400);
 158     }
 159
 160     function phraseChanged() {
 161         showPending();
 162         hideValidationError();
 163         setMnemonicLanguage();
 164         // Get the mnemonic phrase
 165         var phrase = DOM.phrase.val();
 166         var errorText = findPhraseErrors(phrase);
 167         if (errorText) {
 168             showValidationError(errorText);
 169             return;
 170         }
 171         // Calculate and display
 172         var passphrase = DOM.passphrase.val();
 173         calcBip32RootKeyFromSeed(phrase, passphrase);
 174         calcForDerivationPath();
 175         hidePending();
 176     }
 177
 178     function delayedEntropyChanged() {
 179         hideValidationError();
 180         showPending();
 181         if (entropyChangeTimeoutEvent != null) {
 182             clearTimeout(entropyChangeTimeoutEvent);
 183         }
 184         entropyChangeTimeoutEvent = setTimeout(entropyChanged, 400);
 185     }
 186
 187     function entropyChanged() {
 188         // If blank entropy, clear mnemonic, addresses, errors
 189         if (DOM.entropy.val().trim().length == 0) {
 190             clearDisplay();
 191             clearEntropyFeedback();
 192             DOM.phrase.val("");
 193             showValidationError("Blank entropy");
 194             return;
 195         }
 196         // Get the current phrase to detect changes
 197         var phrase = DOM.phrase.val();
 198         // Set the phrase from the entropy
 199         setMnemonicFromEntropy();
 200         // Recalc addresses if the phrase has changed
 201         var newPhrase = DOM.phrase.val();
 202         if (newPhrase != phrase) {
 203             if (newPhrase.length == 0) {
 204                 clearDisplay();
 205             }
 206             else {
 207                 phraseChanged();
 208             }
 209         }
 210         else {
 211             hidePending();
 212         }
 213     }
 214
 215     function delayedRootKeyChanged() {
 216         // Warn if there is an existing mnemonic or passphrase.
 217         if (DOM.phrase.val().length > 0 || DOM.passphrase.val().length > 0) {
 218             if (!confirm("This will clear existing mnemonic and passphrase")) {
 219                 DOM.rootKey.val(bip32RootKey);
 220                 return
 221             }
 222         }
 223         hideValidationError();
 224         showPending();
 225         // Clear existing mnemonic and passphrase
 226         DOM.phrase.val("");
 227         DOM.passphrase.val("");
 228         seed = null;
 229         if (rootKeyChangedTimeoutEvent != null) {
 230             clearTimeout(rootKeyChangedTimeoutEvent);
 231         }
 232         rootKeyChangedTimeoutEvent = setTimeout(rootKeyChanged, 400);
 233     }
 234
 235     function rootKeyChanged() {
 236         showPending();
 237         hideValidationError();
 238         // Validate the root key TODO
 239         var rootKeyBase58 = DOM.rootKey.val();
 240         var errorText = validateRootKey(rootKeyBase58);
 241         if (errorText) {
 242             showValidationError(errorText);
 243             return;
 244         }
 245         // Calculate and display
 246         calcBip32RootKeyFromBase58(rootKeyBase58);
 247         calcForDerivationPath();
 248     }
 249
 250     function calcForDerivationPath() {
 251         showPending();
 252         clearAddressesList();
 253         hideValidationError();
 254         // Get the derivation path
 255         var derivationPath = getDerivationPath();
 256         var errorText = findDerivationPathErrors(derivationPath);
 257         if (errorText) {
 258             showValidationError(errorText);
 259             return;
 260         }
 261         bip32ExtendedKey = calcBip32ExtendedKey(derivationPath);
 262         if (bip44TabSelected()) {
 263             displayBip44Info();
 264         }
 265         displayBip32Info();
 266         hidePending();
 267     }
 268
 269     function generateClicked() {
 270         if (isUsingOwnEntropy()) {
 271             return;
 272         }
 273         clearDisplay();
 274         showPending();
 275         setTimeout(function() {
 276             setMnemonicLanguage();
 277             var phrase = generateRandomPhrase();
 278             if (!phrase) {
 279                 return;
 280             }
 281             phraseChanged();
 282         }, 50);
 283     }
 284
 285     function languageChanged() {
 286         setTimeout(function() {
 287             setMnemonicLanguage();
 288             if (DOM.phrase.val().length > 0) {
 289                 var newPhrase = convertPhraseToNewLanguage();
 290                 DOM.phrase.val(newPhrase);
 291                 phraseChanged();
 292             }
 293             else {
 294                 DOM.generate.trigger("click");
 295             }
 296         }, 50);
 297     }
 298
 299     function toggleIndexes() {
 300         showIndex = !showIndex;
 301         $("td.index span").toggleClass("invisible");
 302     }
 303
 304     function toggleAddresses() {
 305         showAddress = !showAddress;
 306         $("td.address span").toggleClass("invisible");
 307     }
 308
 309     function togglePublicKeys() {
 310         showPubKey = !showPubKey;
 311         $("td.pubkey span").toggleClass("invisible");
 312     }
 313
 314     function togglePrivateKeys() {
 315         showPrivKey = !showPrivKey;
 316         $("td.privkey span").toggleClass("invisible");
 317     }
 318
 319     // Private methods
 320
 321     function generateRandomPhrase() {
 322         if (!hasStrongRandom()) {
 323             var errorText = "This browser does not support strong randomness";
 324             showValidationError(errorText);
 325             return;
 326         }
 327         var numWords = parseInt(DOM.generatedStrength.val());
 328         var strength = numWords / 3 * 32;
 329         var words = mnemonic.generate(strength);
 330         DOM.phrase.val(words);
 331         return words;
 332     }
 333
 334     function calcBip32RootKeyFromSeed(phrase, passphrase) {
 335         seed = mnemonic.toSeed(phrase, passphrase);
 336         bip32RootKey = bitcoin.HDNode.fromSeedHex(seed, network);
 337     }
 338
 339     function calcBip32RootKeyFromBase58(rootKeyBase58) {
 340         bip32RootKey = bitcoin.HDNode.fromBase58(rootKeyBase58, network);
 341     }
 342
 343     function calcBip32ExtendedKey(path) {
 344         // Check there's a root key to derive from
 345         if (!bip32RootKey) {
 346             return bip32RootKey;
 347         }
 348         var extendedKey = bip32RootKey;
 349         // Derive the key from the path
 350         var pathBits = path.split("/");
 351         for (var i=0; i<pathBits.length; i++) {
 352             var bit = pathBits[i];
 353             var index = parseInt(bit);
 354             if (isNaN(index)) {
 355                 continue;
 356             }
 357             var hardened = bit[bit.length-1] == "'";
 358             var isPriv = "privKey" in extendedKey;
 359             var invalidDerivationPath = hardened && !isPriv;
 360             if (invalidDerivationPath) {
 361                 extendedKey = null;
 362             }
 363             else if (hardened) {
 364                 extendedKey = extendedKey.deriveHardened(index);
 365             }
 366             else {
 367                 extendedKey = extendedKey.derive(index);
 368             }
 369         }
 370         return extendedKey
 371     }
 372
 373     function showValidationError(errorText) {
 374         DOM.feedback
 375             .text(errorText)
 376             .show();
 377     }
 378
 379     function hideValidationError() {
 380         DOM.feedback
 381             .text("")
 382             .hide();
 383     }
 384
 385     function findPhraseErrors(phrase) {
 386         // Preprocess the words
 387         phrase = mnemonic.normalizeString(phrase);
 388         var words = phraseToWordArray(phrase);
 389         // Detect blank phrase
 390         if (words.length == 0) {
 391             return "Blank mnemonic";
 392         }
 393         // Check each word
 394         for (var i=0; i<words.length; i++) {
 395             var word = words[i];
 396             var language = getLanguage();
 397             if (WORDLISTS[language].indexOf(word) == -1) {
 398                 console.log("Finding closest match to " + word);
 399                 var nearestWord = findNearestWord(word);
 400                 return word + " not in wordlist, did you mean " + nearestWord + "?";
 401             }
 402         }
 403         // Check the words are valid
 404         var properPhrase = wordArrayToPhrase(words);
 405         var isValid = mnemonic.check(properPhrase);
 406         if (!isValid) {
 407             return "Invalid mnemonic";
 408         }
 409         return false;
 410     }
 411
 412     function validateRootKey(rootKeyBase58) {
 413         try {
 414             bitcoin.HDNode.fromBase58(rootKeyBase58);
 415         }
 416         catch (e) {
 417             return "Invalid root key";
 418         }
 419         return "";
 420     }
 421
 422     function getDerivationPath() {
 423         if (bip44TabSelected()) {
 424             var purpose = parseIntNoNaN(DOM.bip44purpose.val(), 44);
 425             var coin = parseIntNoNaN(DOM.bip44coin.val(), 0);
 426             var account = parseIntNoNaN(DOM.bip44account.val(), 0);
 427             var change = parseIntNoNaN(DOM.bip44change.val(), 0);
 428             var path = "m/";
 429             path += purpose + "'/";
 430             path += coin + "'/";
 431             path += account + "'/";
 432             path += change;
 433             DOM.bip44path.val(path);
 434             var derivationPath = DOM.bip44path.val();
 435             console.log("Using derivation path from BIP44 tab: " + derivationPath);
 436             return derivationPath;
 437         }
 438         else if (bip32TabSelected()) {
 439             var derivationPath = DOM.bip32path.val();
 440             console.log("Using derivation path from BIP32 tab: " + derivationPath);
 441             return derivationPath;
 442         }
 443         else {
 444             console.log("Unknown derivation path");
 445         }
 446     }
 447
 448     function findDerivationPathErrors(path) {
 449         // TODO is not perfect but is better than nothing
 450         // Inspired by
 451         // https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#test-vectors
 452         // and
 453         // https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#extended-keys
 454         var maxDepth = 255; // TODO verify this!!
 455         var maxIndexValue = Math.pow(2, 31); // TODO verify this!!
 456         if (path[0] != "m") {
 457             return "First character must be 'm'";
 458         }
 459         if (path.length > 1) {
 460             if (path[1] != "/") {
 461                 return "Separator must be '/'";
 462             }
 463             var indexes = path.split("/");
 464             if (indexes.length > maxDepth) {
 465                 return "Derivation depth is " + indexes.length + ", must be less than " + maxDepth;
 466             }
 467             for (var depth = 1; depth<indexes.length; depth++) {
 468                 var index = indexes[depth];
 469                 var invalidChars = index.replace(/^[0-9]+'?$/g, "")
 470                 if (invalidChars.length > 0) {
 471                     return "Invalid characters " + invalidChars + " found at depth " + depth;
 472                 }
 473                 var indexValue = parseInt(index.replace("'", ""));
 474                 if (isNaN(depth)) {
 475                     return "Invalid number at depth " + depth;
 476                 }
 477                 if (indexValue > maxIndexValue) {
 478                     return "Value of " + indexValue + " at depth " + depth + " must be less than " + maxIndexValue;
 479                 }
 480             }
 481         }
 482         // Check root key exists or else derivation path is useless!
 483         if (!bip32RootKey) {
 484             return "No root key";
 485         }
 486         // Check no hardened derivation path when using xpub keys
 487         var hardened = path.indexOf("'") > -1;
 488         var isXpubkey = !("privKey" in bip32RootKey);
 489         if (hardened && isXpubkey) {
 490             return "Hardened derivation path is invalid with xpub key";
 491         }
 492         return false;
 493     }
 494
 495     function displayBip44Info() {
 496         // Get the derivation path for the account
 497         var purpose = parseIntNoNaN(DOM.bip44purpose.val(), 44);
 498         var coin = parseIntNoNaN(DOM.bip44coin.val(), 0);
 499         var account = parseIntNoNaN(DOM.bip44account.val(), 0);
 500         var path = "m/";
 501         path += purpose + "'/";
 502         path += coin + "'/";
 503         path += account + "'/";
 504         // Calculate the account extended keys
 505         var accountExtendedKey = calcBip32ExtendedKey(path);
 506         var accountXprv = accountExtendedKey.toBase58();
 507         var accountXpub = accountExtendedKey.toBase58(false);
 508         // Display the extended keys
 509         DOM.bip44accountXprv.val(accountXprv);
 510         DOM.bip44accountXpub.val(accountXpub);
 511     }
 512
 513     function displayBip32Info() {
 514         // Display the key
 515         DOM.seed.val(seed);
 516         var rootKey = bip32RootKey.toBase58();
 517         DOM.rootKey.val(rootKey);
 518         var xprvkeyB58 = "NA";
 519         if (bip32ExtendedKey.privKey) {
 520             xprvkeyB58 = bip32ExtendedKey.toBase58();
 521         }
 522         var extendedPrivKey = xprvkeyB58;
 523         DOM.extendedPrivKey.val(extendedPrivKey);
 524         var extendedPubKey = bip32ExtendedKey.toBase58(false);
 525         DOM.extendedPubKey.val(extendedPubKey);
 526         // Display the addresses and privkeys
 527         clearAddressesList();
 528         displayAddresses(0, 20);
 529     }
 530
 531     function displayAddresses(start, total) {
 532         generationProcesses.push(new (function() {
 533
 534             var rows = [];
 535
 536             this.stop = function() {
 537                 for (var i=0; i<rows.length; i++) {
 538                     rows[i].shouldGenerate = false;
 539                 }
 540             }
 541
 542             for (var i=0; i<total; i++) {
 543                 var index = i + start;
 544                 rows.push(new TableRow(index));
 545             }
 546
 547         })());
 548     }
 549
 550     function TableRow(index) {
 551
 552         var self = this;
 553         this.shouldGenerate = true;
 554         var useHardenedAddresses = DOM.hardenedAddresses.prop("checked");
 555
 556         function init() {
 557             calculateValues();
 558         }
 559
 560         function calculateValues() {
 561             setTimeout(function() {
 562                 if (!self.shouldGenerate) {
 563                     return;
 564                 }
 565                 var key = "";
 566                 if (useHardenedAddresses) {
 567                     key = bip32ExtendedKey.deriveHardened(index);
 568                 }
 569                 else {
 570                     key = bip32ExtendedKey.derive(index);
 571                 }
 572                 var address = key.getAddress().toString();
 573                 var privkey = "NA";
 574                 if (key.privKey) {
 575                     privkey = key.privKey.toWIF(network);
 576                 }
 577                 var pubkey = key.pubKey.toHex();
 578                 var indexText = getDerivationPath() + "/" + index;
 579                 if (useHardenedAddresses) {
 580                     indexText = indexText + "'";
 581                 }
 582                 addAddressToList(indexText, address, pubkey, privkey);
 583             }, 50)
 584         }
 585
 586         init();
 587
 588     }
 589
 590     function showMore() {
 591         var start = DOM.addresses.children().length;
 592         var rowsToAdd = parseInt(DOM.rowsToAdd.val());
 593         if (isNaN(rowsToAdd)) {
 594             rowsToAdd = 20;
 595             DOM.rowsToAdd.val("20");
 596         }
 597         if (rowsToAdd > 200) {
 598             var msg = "Generating " + rowsToAdd + " rows could take a while. ";
 599             msg += "Do you want to continue?";
 600             if (!confirm(msg)) {
 601                 return;
 602             }
 603         }
 604         displayAddresses(start, rowsToAdd);
 605     }
 606
 607     function clearDisplay() {
 608         clearAddressesList();
 609         clearKey();
 610         hideValidationError();
 611     }
 612
 613     function clearAddressesList() {
 614         DOM.addresses.empty();
 615         stopGenerating();
 616     }
 617
 618     function stopGenerating() {
 619         while (generationProcesses.length > 0) {
 620             var generation = generationProcesses.shift();
 621             generation.stop();
 622         }
 623     }
 624
 625     function clearKey() {
 626         DOM.rootKey.val("");
 627         DOM.extendedPrivKey.val("");
 628         DOM.extendedPubKey.val("");
 629     }
 630
 631     function addAddressToList(indexText, address, pubkey, privkey) {
 632         var row = $(addressRowTemplate.html());
 633         // Elements
 634         var indexCell = row.find(".index span");
 635         var addressCell = row.find(".address span");
 636         var pubkeyCell = row.find(".pubkey span");
 637         var privkeyCell = row.find(".privkey span");
 638         // Content
 639         indexCell.text(indexText);
 640         addressCell.text(address);
 641         pubkeyCell.text(pubkey);
 642         privkeyCell.text(privkey);
 643         // Visibility
 644         if (!showIndex) {
 645             indexCell.addClass("invisible");
 646         }
 647         if (!showAddress) {
 648             addressCell.addClass("invisible");
 649         }
 650         if (!showPubKey) {
 651             pubkeyCell.addClass("invisible");
 652         }
 653         if (!showPrivKey) {
 654             privkeyCell.addClass("invisible");
 655         }
 656         DOM.addresses.append(row);
 657         var rowShowQrEls = row.find("[data-show-qr]");
 658         setQrEvents(rowShowQrEls);
 659     }
 660
 661     function hasStrongRandom() {
 662         return 'crypto' in window && window['crypto'] !== null;
 663     }
 664
 665     function disableForms() {
 666         $("form").on("submit", function(e) {
 667             e.preventDefault();
 668         });
 669     }
 670
 671     function parseIntNoNaN(val, defaultVal) {
 672         var v = parseInt(val);
 673         if (isNaN(v)) {
 674             return defaultVal;
 675         }
 676         return v;
 677     }
 678
 679     function showPending() {
 680         DOM.feedback
 681             .text("Calculating...")
 682             .show();
 683     }
 684
 685     function findNearestWord(word) {
 686         var language = getLanguage();
 687         var words = WORDLISTS[language];
 688         var minDistance = 99;
 689         var closestWord = words[0];
 690         for (var i=0; i<words.length; i++) {
 691             var comparedTo = words[i];
 692             if (comparedTo.indexOf(word) == 0) {
 693                 return comparedTo;
 694             }
 695             var distance = Levenshtein.get(word, comparedTo);
 696             if (distance < minDistance) {
 697                 closestWord = comparedTo;
 698                 minDistance = distance;
 699             }
 700         }
 701         return closestWord;
 702     }
 703
 704     function hidePending() {
 705         DOM.feedback
 706             .text("")
 707             .hide();
 708     }
 709
 710     function populateNetworkSelect() {
 711         for (var i=0; i<networks.length; i++) {
 712             var network = networks[i];
 713             var option = $("<option>");
 714             option.attr("value", i);
 715             option.text(network.name);
 716             DOM.phraseNetwork.append(option);
 717         }
 718     }
 719
 720     function populateClientSelect() {
 721         for (var i=0; i<clients.length; i++) {
 722             var client = clients[i];
 723             var option = $("<option>");
 724             option.attr("value", i);
 725             option.text(client.name);
 726             DOM.phraseClient.append(option);
 727         }
 728     }
 729
 730     function getLanguage() {
 731         var defaultLanguage = "english";
 732         // Try to get from existing phrase
 733         var language = getLanguageFromPhrase();
 734         // Try to get from url if not from phrase
 735         if (language.length == 0) {
 736             language = getLanguageFromUrl();
 737         }
 738         // Default to English if no other option
 739         if (language.length == 0) {
 740             language = defaultLanguage;
 741         }
 742         return language;
 743     }
 744
 745     function getLanguageFromPhrase(phrase) {
 746         // Check if how many words from existing phrase match a language.
 747         var language = "";
 748         if (!phrase) {
 749             phrase = DOM.phrase.val();
 750         }
 751         if (phrase.length > 0) {
 752             var words = phraseToWordArray(phrase);
 753             var languageMatches = {};
 754             for (l in WORDLISTS) {
 755                 // Track how many words match in this language
 756                 languageMatches[l] = 0;
 757                 for (var i=0; i<words.length; i++) {
 758                     var wordInLanguage = WORDLISTS[l].indexOf(words[i]) > -1;
 759                     if (wordInLanguage) {
 760                         languageMatches[l]++;
 761                     }
 762                 }
 763                 // Find languages with most word matches.
 764                 // This is made difficult due to commonalities between Chinese
 765                 // simplified vs traditional.
 766                 var mostMatches = 0;
 767                 var mostMatchedLanguages = [];
 768                 for (var l in languageMatches) {
 769                     var numMatches = languageMatches[l];
 770                     if (numMatches > mostMatches) {
 771                         mostMatches = numMatches;
 772                         mostMatchedLanguages = [l];
 773                     }
 774                     else if (numMatches == mostMatches) {
 775                         mostMatchedLanguages.push(l);
 776                     }
 777                 }
 778             }
 779             if (mostMatchedLanguages.length > 0) {
 780                 // Use first language and warn if multiple detected
 781                 language = mostMatchedLanguages[0];
 782                 if (mostMatchedLanguages.length > 1) {
 783                     console.warn("Multiple possible languages");
 784                     console.warn(mostMatchedLanguages);
 785                 }
 786             }
 787         }
 788         return language;
 789     }
 790
 791     function getLanguageFromUrl() {
 792         for (var language in WORDLISTS) {
 793             if (window.location.hash.indexOf(language) > -1) {
 794                 return language;
 795             }
 796         }
 797         return "";
 798     }
 799
 800     function setMnemonicLanguage() {
 801         var language = getLanguage();
 802         // Load the bip39 mnemonic generator for this language if required
 803         if (!(language in mnemonics)) {
 804             mnemonics[language] = new Mnemonic(language);
 805         }
 806         mnemonic = mnemonics[language];
 807     }
 808
 809     function convertPhraseToNewLanguage() {
 810         var oldLanguage = getLanguageFromPhrase();
 811         var newLanguage = getLanguageFromUrl();
 812         var oldPhrase = DOM.phrase.val();
 813         var oldWords = phraseToWordArray(oldPhrase);
 814         var newWords = [];
 815         for (var i=0; i<oldWords.length; i++) {
 816             var oldWord = oldWords[i];
 817             var index = WORDLISTS[oldLanguage].indexOf(oldWord);
 818             var newWord = WORDLISTS[newLanguage][index];
 819             newWords.push(newWord);
 820         }
 821         newPhrase = wordArrayToPhrase(newWords);
 822         return newPhrase;
 823     }
 824
 825     // TODO look at jsbip39 - mnemonic.splitWords
 826     function phraseToWordArray(phrase) {
 827         var words = phrase.split(/\s/g);
 828         var noBlanks = [];
 829         for (var i=0; i<words.length; i++) {
 830             var word = words[i];
 831             if (word.length > 0) {
 832                 noBlanks.push(word);
 833             }
 834         }
 835         return noBlanks;
 836     }
 837
 838     // TODO look at jsbip39 - mnemonic.joinWords
 839     function wordArrayToPhrase(words) {
 840         var phrase = words.join(" ");
 841         var language = getLanguageFromPhrase(phrase);
 842         if (language == "japanese") {
 843             phrase = words.join("\u3000");
 844         }
 845         return phrase;
 846     }
 847
 848     function isUsingOwnEntropy() {
 849         return DOM.useEntropy.prop("checked");
 850     }
 851
 852     function setMnemonicFromEntropy() {
 853         clearEntropyFeedback();
 854         // Get entropy value
 855         var entropyStr = DOM.entropy.val();
 856         // Work out minimum base for entropy
 857         var entropy = Entropy.fromString(entropyStr);
 858         if (entropy.binaryStr.length == 0) {
 859             return;
 860         }
 861         // Show entropy details
 862         showEntropyFeedback(entropy);
 863         // Use entropy hash if not using raw entropy
 864         var bits = entropy.binaryStr;
 865         var mnemonicLength = DOM.entropyMnemonicLength.val();
 866         if (mnemonicLength != "raw") {
 867             // Get bits by hashing entropy with SHA256
 868             var hash = sjcl.hash.sha256.hash(entropy.cleanStr);
 869             var hex = sjcl.codec.hex.fromBits(hash);
 870             bits = BigInteger.parse(hex, 16).toString(2);
 871             while (bits.length % 256 != 0) {
 872                 bits = "0" + bits;
 873             }
 874             // Truncate hash to suit number of words
 875             mnemonicLength = parseInt(mnemonicLength);
 876             var numberOfBits = 32 * mnemonicLength / 3;
 877             bits = bits.substring(0, numberOfBits);
 878         }
 879         // Discard trailing entropy
 880         var bitsToUse = Math.floor(bits.length / 32) * 32;
 881         var start = bits.length - bitsToUse;
 882         var binaryStr = bits.substring(start);
 883         // Convert entropy string to numeric array
 884         var entropyArr = [];
 885         for (var i=0; i<binaryStr.length / 8; i++) {
 886             var byteAsBits = binaryStr.substring(i*8, i*8+8);
 887             var entropyByte = parseInt(byteAsBits, 2);
 888             entropyArr.push(entropyByte)
 889         }
 890         // Convert entropy array to mnemonic
 891         var phrase = mnemonic.toMnemonic(entropyArr);
 892         // Set the mnemonic in the UI
 893         DOM.phrase.val(phrase);
 894     }
 895
 896     function clearEntropyFeedback() {
 897         DOM.entropyStrength.text("...");
 898         DOM.entropyType.text("");
 899         DOM.entropyWordCount.text("0");
 900         DOM.entropyEventCount.text("0");
 901         DOM.entropyBitsPerEvent.text("0");
 902         DOM.entropyBits.text("0");
 903         DOM.entropyFiltered.html("&nbsp;");
 904         DOM.entropyBinary.html("&nbsp;");
 905     }
 906
 907     function showEntropyFeedback(entropy) {
 908         var numberOfBits = entropy.binaryStr.length;
 909         var strength = "extremely weak";
 910         if (numberOfBits >= 64) {
 911             strength = "very weak";
 912         }
 913         if (numberOfBits >= 96) {
 914             strength = "weak";
 915         }
 916         if (numberOfBits >= 128) {
 917             strength = "strong";
 918         }
 919         if (numberOfBits >= 160) {
 920             strength = "very strong";
 921         }
 922         if (numberOfBits >= 192) {
 923             strength = "extremely strong";
 924         }
 925         // If time to crack is less than one day, and password is considered
 926         // strong or better based on the number of bits, rename strength to
 927         // 'easily cracked'.
 928         try {
 929             var z = zxcvbn(entropy.base.parts.join(""));
 930             var timeToCrack = z.crack_times_seconds.offline_fast_hashing_1e10_per_second;
 931             if (timeToCrack < 86400 && entropy.binaryStr.length >= 128) {
 932                 strength = "easily cracked";
 933                 if (z.feedback.warning != "") {
 934                     strength = strength + " - " + z.feedback.warning;
 935                 };
 936             }
 937         }
 938         catch (e) {
 939             strength = "unknown";
 940             console.log("Error detecting entropy strength with zxcvbn:");
 941             console.log(e);
 942         }
 943         var entropyTypeStr = getEntropyTypeStr(entropy);
 944         var wordCount = Math.floor(numberOfBits / 32) * 3;
 945         var bitsPerEvent = entropy.bitsPerEvent.toFixed(2);
 946         DOM.entropyFiltered.html(entropy.cleanHtml);
 947         DOM.entropyType.text(entropyTypeStr);
 948         DOM.entropyStrength.text(strength);
 949         DOM.entropyEventCount.text(entropy.base.ints.length);
 950         DOM.entropyBits.text(numberOfBits);
 951         DOM.entropyWordCount.text(wordCount);
 952         DOM.entropyBinary.text(entropy.binaryStr);
 953         DOM.entropyBitsPerEvent.text(bitsPerEvent);
 954     }
 955
 956     function getEntropyTypeStr(entropy) {
 957         var typeStr = entropy.base.str;
 958         // Add some detail if these are cards
 959         if (entropy.base.asInt == 52) {
 960             var cardDetail = []; // array of message strings
 961             // Detect duplicates
 962             var dupes = [];
 963             var dupeTracker = {};
 964             for (var i=0; i<entropy.base.parts.length; i++) {
 965                 var card = entropy.base.parts[i];
 966                 var cardUpper = card.toUpperCase();
 967                 if (cardUpper in dupeTracker) {
 968                     dupes.push(card);
 969                 }
 970                 dupeTracker[cardUpper] = true;
 971             }
 972             if (dupes.length > 0) {
 973                 var dupeWord = "duplicates";
 974                 if (dupes.length == 1) {
 975                     dupeWord = "duplicate";
 976                 }
 977                 var msg = dupes.length + " " + dupeWord + ": " + dupes.slice(0,3).join(" ");
 978                 if (dupes.length > 3) {
 979                     msg += "...";
 980                 }
 981                 cardDetail.push(msg);
 982             }
 983             // Detect full deck
 984             var uniqueCards = [];
 985             for (var uniqueCard in dupeTracker) {
 986                 uniqueCards.push(uniqueCard);
 987             }
 988             if (uniqueCards.length == 52) {
 989                 cardDetail.unshift("full deck");
 990             }
 991             // Detect missing cards
 992             var values = "A23456789TJQK";
 993             var suits = "CDHS";
 994             var missingCards = [];
 995             for (var i=0; i<suits.length; i++) {
 996                 for (var j=0; j<values.length; j++) {
 997                     var card = values[j] + suits[i];
 998                     if (!(card in dupeTracker)) {
 999                         missingCards.push(card);
1000                     }
1001                 }
1002             }
1003             // Display missing cards if six or less, ie clearly going for full deck
1004             if (missingCards.length > 0 && missingCards.length <= 6) {
1005                 var msg = missingCards.length + " missing: " + missingCards.slice(0,3).join(" ");
1006                 if (missingCards.length > 3) {
1007                     msg += "...";
1008                 }
1009                 cardDetail.push(msg);
1010             }
1011             // Add card details to typeStr
1012             if (cardDetail.length > 0) {
1013                 typeStr += " (" + cardDetail.join(", ") + ")";
1014             }
1015         }
1016         return typeStr;
1017     }
1018
1019     function setQrEvents(els) {
1020         els.on("mouseenter", createQr);
1021         els.on("mouseleave", destroyQr);
1022         els.on("click", toggleQr);
1023     }
1024
1025     function createQr(e) {
1026         var content = e.target.textContent || e.target.value;
1027         if (content) {
1028             var size = 130;
1029             DOM.qrImage.qrcode({width: size, height: size, text: content});
1030             if (!showQr) {
1031                 DOM.qrHider.addClass("hidden");
1032             }
1033             else {
1034                 DOM.qrHider.removeClass("hidden");
1035             }
1036             DOM.qrContainer.removeClass("hidden");
1037         }
1038     }
1039
1040     function destroyQr() {
1041         DOM.qrImage.text("");
1042         DOM.qrContainer.addClass("hidden");
1043     }
1044
1045     function toggleQr() {
1046         showQr = !showQr;
1047         DOM.qrHider.toggleClass("hidden");
1048         DOM.qrHint.toggleClass("hidden");
1049     }
1050
1051     function bip44TabSelected() {
1052         return DOM.bip44tab.hasClass("active");
1053     }
1054
1055     function bip32TabSelected() {
1056         return DOM.bip32tab.hasClass("active");
1057     }
1058
1059     var networks = [
1060         {
1061             name: "Bitcoin",
1062             onSelect: function() {
1063                 network = bitcoin.networks.bitcoin;
1064                 DOM.bip44coin.val(0);
1065             },
1066         },
1067         {
1068             name: "Bitcoin Testnet",
1069             onSelect: function() {
1070                 network = bitcoin.networks.testnet;
1071                 DOM.bip44coin.val(1);
1072             },
1073         },
1074         {
1075             name: "Litecoin",
1076             onSelect: function() {
1077                 network = bitcoin.networks.litecoin;
1078                 DOM.bip44coin.val(2);
1079             },
1080         },
1081         {
1082             name: "Dogecoin",
1083             onSelect: function() {
1084                 network = bitcoin.networks.dogecoin;
1085                 DOM.bip44coin.val(3);
1086             },
1087         },
1088         {
1089             name: "ShadowCash",
1090             onSelect: function() {
1091                 network = bitcoin.networks.shadow;
1092                 DOM.bip44coin.val(35);
1093             },
1094         },
1095         {
1096             name: "ShadowCash Testnet",
1097             onSelect: function() {
1098                 network = bitcoin.networks.shadowtn;
1099                 DOM.bip44coin.val(1);
1100             },
1101         },
1102         {
1103             name: "Viacoin",
1104             onSelect: function() {
1105                 network = bitcoin.networks.viacoin;
1106                 DOM.bip44coin.val(14);
1107             },
1108         },
1109         {
1110             name: "Viacoin Testnet",
1111             onSelect: function() {
1112                 network = bitcoin.networks.viacointestnet;
1113                 DOM.bip44coin.val(1);
1114             },
1115         },
1116         {
1117             name: "Jumbucks",
1118             onSelect: function() {
1119                 network = bitcoin.networks.jumbucks;
1120                 DOM.bip44coin.val(26);
1121             },
1122         },
1123         {
1124             name: "CLAM",
1125             onSelect: function() {
1126                 network = bitcoin.networks.clam;
1127                 DOM.bip44coin.val(23);
1128             },
1129         },
1130         {
1131             name: "DASH",
1132             onSelect: function() {
1133                 network = bitcoin.networks.dash;
1134                 DOM.bip44coin.val(5);
1135             },
1136         },
1137         {
1138             name: "Namecoin",
1139             onSelect: function() {
1140                 network = bitcoin.networks.namecoin;
1141                 DOM.bip44coin.val(7);
1142             },
1143         },
1144         {
1145             name: "Peercoin",
1146             onSelect: function() {
1147                 network = bitcoin.networks.peercoin;
1148                 DOM.bip44coin.val(6);
1149             },
1150         },
1151     ]
1152
1153     var clients = [
1154         {
1155             name: "Bitcoin Core",
1156             onSelect: function() {
1157                 DOM.bip32path.val("m/0'/0'");
1158                 DOM.hardenedAddresses.prop('checked', true);
1159             },
1160         },
1161         {
1162             name: "blockchain.info",
1163             onSelect: function() {
1164                 DOM.bip32path.val("m/44'/0'/0'");
1165                 DOM.hardenedAddresses.prop('checked', false);
1166             },
1167         },
1168         {
1169             name: "MultiBit HD",
1170             onSelect: function() {
1171                 DOM.bip32path.val("m/0'/0");
1172                 DOM.hardenedAddresses.prop('checked', false);
1173             },
1174         }
1175     ]
1176
1177     init();
1178
1179 })();